Keywords for scooters

I wonder which long tail keywords to use for scooters.
That is push scooters for children.
There are different types of scooters, trick scooters, stunt scooters and ordinary scooters.
I just don't have any ideas for long tail keywords.
Trick scooters with two wheels? Awesome looking green stunt scooter?

That is a tough one...I think of scooters as motor bikes or motorcycles, as I bet most do. I think of the kind of scooters you're referring to as more of a toy.
Another way would be to find a couple of top sites selling these types of scooters and check the source, hopefully they have the keyword tag filled out.